very true fact indeed. which is why many MX racers tend to trim or cut down teh fenders. but for MX its also helpful for keeping the same line and staying out of the trenches....that way they can keep an eye on their front tires and put them right where they want them.....Shaved fenders also help when your off your seat in a fast corner, it gives you more room and your pants wont snag or your knees wont hit the front fenders.
theres a ton of reasons to cut front fenders. if you dont do a lot of mud riding, and theres not a lot of spin off in your face...i say remove em....